ColorCodes.art

Resistor Value Calculator

Calculate resistor values in series and parallel circuits, voltage dividers, and solve Ohm's law problems with our comprehensive resistor calculator.

Resistor Calculator

Resistor Values (Ω)

Calculated Results

600.00Ω
Total Resistance
0.020A
Current
0.24W
Power
3
Resistors

Circuit Diagrams & Formulas

Series Circuit

R_total = R₁ + R₂ + R₃ + ...

Same current flows through all resistors

Voltage divides across each resistor

Parallel Circuit

1/R_total = 1/R₁ + 1/R₂ + 1/R₃ + ...

Same voltage across all resistors

Current divides through each path

Ohm's Law & Power Calculations

Voltage

V = I × R

Voltage equals current times resistance

Current

I = V / R

Current equals voltage divided by resistance

Power

P = V × I

Power equals voltage times current

Frequently Asked Questions

How do I calculate resistors in series?

In a series circuit, simply add all resistance values together: R_total = R₁ + R₂ + R₃ + ... The same current flows through all resistors, but voltage divides proportionally across each resistor.

How do I calculate resistors in parallel?

In a parallel circuit, use the reciprocal formula: 1/R_total = 1/R₁ + 1/R₂ + 1/R₃ + ... All resistors have the same voltage across them, but current divides through each path.

What is Ohm's Law?

Ohm's Law states that voltage (V) equals current (I) times resistance (R): V = I × R. This fundamental relationship allows you to calculate any one value if you know the other two.

Related Tools